Cheap flights from Seattle to Ontario (SEA - ONT)

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The best prices from Seattle/Tacoma Intl to Ontario are usually found in July or January, booked 33 days in advance, depart on a Wednesday or Thursday and return on a Tuesday

How to find the cheapest flight from
Seattle (SEA) to Ontario (ONT)

All the information you need to plan the best SEA to ONT flight in 2022: compare Seattle to Ontario flight prices with the expected peak season, weather and rainfall in Ontario.
SEA - ONT
Price
$176 - $271
ONT
Temperature
53.6 - 78.8 °F
ONT
Rainfall
0.1 - 3.4 inches

Popular in

December

High demand for flights, 24% potential price rise

Cheapest in

July

Best time to find cheap flights, 15% potential price drop

Round-trip from

$176

From Seattle/Tacoma Intl to Ontario

One-way from

$118

One-way flight from Seattle/Tacoma Intl to Ontario

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
What is the cheapest month to fly from Seattle to Ontario?

Flights from Seattle to Ontario lean towards being more expensive in December. Prices are generally better when you fly from Seattle to Ontario in May, with the cheapest ticket starting at $103.

When is the cheapest time to fly from Seattle to Ontario (SEA - ONT)?

A simple way to save on the total cost of your ticket is to fly from Seattle to Ontario in the afternoon. If you’re flexible enough to do this you can expect to save up to 29% on your trip compared to booking a flight at noon.

What is the cheapest day to fly round-trip from Seattle to Ontario?

Flying to your destination on a Sunday can be more expensive, but this shouldn’t discourage you from finding affordable options to get to Ontario. Check prices with Cheapflights to find a great deal for your trip.

How far in advance should I book a flight from Seattle to Ontario?

Users have found that booking a flight from Seattle to Ontario at least 59 days early can save you up to 100% on average compared to booking a flight this week. If booking 59 days before your flight isn’t an option for you, users have found flights from Seattle to Ontario for as little as $246 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $359 for flights departing within the next 3 days.

Cheap flights from Seattle to Ontario in May, June 2022

The best prices found for SEA to ONT flights for May, June
7 Jun - 8 Jun
$236pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
1 Jun - 14 Jun
$248pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
4 Jun - 16 Jun
$250pp
SEA
Seattle/Tacoma Intl
Frontier
 
1 STOP
ONT
Ontario
ONT
Ontario
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl

Seattle/Tacoma Intl to Ontario 2022 flight deals

Cheap flights to Ontario from Seattle found for this year
13 Sep - 17 Sep
$198pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
ONT
Ontario
ONT
Ontario
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
3 Sep - 14 Sep
$199pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
Non-Stop
ONT
Ontario
ONT
Ontario
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
3 Sep - 15 Sep
$206pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
Non-Stop
ONT
Ontario
ONT
Ontario
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl

Non-stop flights to Ontario from Seattle

Save time with Seattle to Ontario direct flight deals
13 Sep - 21 Sep
$198pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
ONT
Ontario
ONT
Ontario
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
3 Sep - 14 Sep
$199pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
Non-Stop
ONT
Ontario
ONT
Ontario
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
3 Sep - 15 Sep
$206pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
Non-Stop
ONT
Ontario
ONT
Ontario
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl

Last minute flights from Seattle to Ontario

Late deals on round-trip flights to Ontario from Seattle, departing today and this week
1 Jun - 14 Jun
$248pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
4 Jun - 16 Jun
$250pp
SEA
Seattle/Tacoma Intl
Frontier
 
1 STOP
ONT
Ontario
ONT
Ontario
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl
1 Jun - 8 Jun
$251pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl

One-way flights to Ontario from Seattle

The cheapest one-way flights from Seattle to Ontario
3:10 pm - 7:45 pm
Delta
1 Stop
4h 35m
SEA - ONT
Delta
$118
Delta
7:17 am - 4:39 pm
Frontier
1 Stop
9h 22m
SEA - ONT
Frontier
$125
Kiwi.com
5:00 pm - 7:32 pm
Alaska Airlines
Nonstop
2h 32m
SEA - ONT
Alaska Airlines

Related info for your journey

Useful info, stats and facts about <span class="emphasized">Seattle</span> to <span class="emphasized">Ontario</span> flights.

Flight FAQs

From Seattle to Ontario

What airports do I use to fly from Seattle to Ontario?

Booking a flight from Seattle/Tacoma Intl (SEA) to Ontario (ONT) is your only option if you wish to fly from Seattle to Ontario. On a typical day, there are 11 flights from Seattle/Tacoma Intl to Ontario, all of which are around 2h 32m for a nonstop flight. You can also purchase a plane ticket from 9 airlines when you book a flight from Seattle/Tacoma Intl to Ontario.

Which airlines flying from Seattle/Tacoma Intl to Ontario have flexible cancellations due to COVID-19?

Due to the rapidly changing circumstances due to COVID-19, airlines like Alaska Airlines, Delta, and Juneyao Airlines flying from Seattle/Tacoma Intl to Ontario have implemented new flexible cancellation policies.

Can I find flights from Seattle to Ontario for under $200 on Cheapflights?

Yes, there are multiple flights from Seattle to Ontario for under $200. The cheapest flight booked recently is on Alaska Airlines for just $198, but on average you can expect to pay $217.

Are there nonstop flights from Seattle to Ontario for under $200 on Cheapflights?

Cheapflights has at least 20 direct flights from Seattle to Ontario under $200. A good price for a nonstop flight from Seattle to Ontario is less than $232.

Are there last-minute flights available from Seattle to Ontario for under $300?

There are currently 20+ open flights from Seattle to Ontario within the next 7 days for less than $300.

What days are nonstop flights available from Seattle to Ontario?

You can find nonstop flights on the following days: Sunday, Thursday, Friday, Saturday.

How popular is this Seattle to Ontario flight route?

This flight path from Seattle/Tacoma Intl to Ontario was viewed by 60 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

How many flights depart from Seattle to Ontario on average per day?

Travelers can expect 4 flights from Seattle to Ontario on average per day.
Afternoon (Noon - 6pm) - 75% of flight departures
Evening (6pm - Midnight) - 25% of flight departures

How long is the flight from Seattle to Ontario?

A quick flight from Seattle to Ontario can take about 2h 39m. Alaska Airlines provides one of the quickest options available for as low as $198. The distance from Seattle to Ontario is about 962 mi. Both multi-stop and nonstop flights can be found to your destination and back.

What are the cheapest airlines flying from Seattle to Ontario round-trip?

Our cheapest airline available from Seattle to Ontario is Alaska Airlines. Our recent data shows that you can find tickets from as low as $198 on this airline. Additional options worth looking into are Delta and Frontier, starting at $207 and $246 round-trip. Alaska Airlines is priced at 4% lower than the current average price of a flight leaving 3 months from now.

What are the cheapest airlines to fly from Seattle to Ontario one-way?

For one-way options, check prices for Alaska Airlines. According to our data, you can fly for as low as $94. Users have also found prices from $99 and $101 on Delta and Frontier, respectively.

What are the most popular airlines that fly from Seattle to Ontario?

American Airlines, Alaska Airlines and Delta are the most popular airlines when flying from Seattle to Ontario.

What are the cheapest flights from Seattle to Ontario?

Looking at all options, your cheapest flight can be booked for $98. While the most popular route (Seattle/Tacoma Intl - Ontario) can be booked for $198 on average our data indicates $420 when flying from Seattle to Ontario.

What are the most reliable airlines from Seattle to Ontario?

Before booking your flight to Ontario from Seattle, check out the most reliable airlines to get you to your destination on time: SkyWest Airlines (96%), Delta (96%), KLM( 94%).

COVID Restrictions

View COVID Travel Restrictions for Ontario, CA

Do I need a COVID test to fly to Ontario from Seattle?

Information is based on travel restrictions for travel to Ontario within the United States

Most visitors from Seattle/Tacoma Intl need to provide a negative COVID-19 test result and/or quarantine to enter Ontario.

COVID-19 testing requirements
Visitors from Seattle/Tacoma Intl must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 1 day for RT-PCR (NAAT) and 1 day for Antigen (quick-test) before departing to Ontario.

Quarantine requirements
Visitors from Seattle/Tacoma Intl are not required to quarantine after entering Ontario.

Do I need a test to fly back to Seattle from Ontario?

Returning to Seattle/Tacoma Intl from Ontario

COVID-19 testing requirements
Visitors from Ontario must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 1 day for RT-PCR (NAAT) and 1 day for Antigen (quick-test) before departing to Seattle/Tacoma Intl.

Quarantine requirements
Visitors from Ontario are not required to quarantine after entering Seattle/Tacoma Intl.

Hide COVID Travel Restrictions for Ontario, CA

Alternative routes for Seattle to Ontario

See prices for flight routes from nearby airports that may be better suited for you.

Destination information for Ontario

Things to know before you go - useful duration and weather info for your trip from Seattle to Ontario.
Flight duration from SEA to ONT
2h 43m

Airports servicing Seattle

Airports servicing Ontario

Top 4 airlines flying from Seattle/Tacoma Intl to Ontario

The chart below displays the airlines Cheapflights users traveling from Seattle to Ontario choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
Airline Cheapest Average Flexibility On-time COVID-19 safety
Juneyao Airlines
$14 $20 No cancel fee 66%

We couldn't confirm the COVID-19 safety measures taken by Juneyao Airlines. Please check directly on their website for additional information.

United Airlines
$71 $304 No cancel fee 69%
Delta
$78 $247 No cancel fee N/A
Alaska Airlines
$81 $197 No cancel fee 75%

Hourly flight availability from Seattle to Ontario

See what time of day planes typically take off from Seattle towards Ontario.
Evening 6 PM to midnight 45% of SEA to ONT departures
Afternoon Noon to 6 PM 35% of SEA to ONT departures
Early morning Midnight to 6 AM 12% of SEA to ONT departures
Morning 6 AM to noon 8% of SEA to ONT departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from Seattle to Ontario
See how many times per day planes take to the skies headed from Seattle to Ontario.
Sunday
10 daily flights
Monday
14 daily flights
Tuesday
10 daily flights
Wednesday
12 daily flights
Thursday
14 daily flights
Friday
13 daily flights
Saturday
6 daily flights
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